ALSA: seq: Use atomic ops for autoload refcount

... just to robustify for races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c
index 91a786a783e1e7cd563f516df09b9c94e64214eb..775ea9390110243760339a1542880589f82185d5 100644 (file)
--- a/sound/core/seq/seq_device.c
+++ b/sound/core/seq/seq_device.c
@@ -127,15 +127,15 @@ static void snd_seq_device_info(struct snd_info_entry *entry,
 
 #ifdef CONFIG_MODULES
 /* avoid auto-loading during module_init() */
-static int snd_seq_in_init;
+static atomic_t snd_seq_in_init = ATOMIC_INIT(0);
 void snd_seq_autoload_lock(void)
 {
-       snd_seq_in_init++;
+       atomic_inc(&snd_seq_in_init);
 }
 
 void snd_seq_autoload_unlock(void)
 {
-       snd_seq_in_init--;
+       atomic_dec(&snd_seq_in_init);
 }
 #endif
 
@@ -147,7 +147,7 @@ void snd_seq_device_load_drivers(void)
        /* Calling request_module during module_init()
         * may cause blocking.
         */
-       if (snd_seq_in_init)
+       if (atomic_read(&snd_seq_in_init))
                return;
 
        mutex_lock(&ops_mutex);